| Maker | Pratt & Whitney Hornet T2E | Pratt & Whitney Hornet S1E3-G | Pratt & Whitney Twin Wasp Jr SB4-G | Pratt & Whitney Twin Wasp SC3-G | Pratt & Whitney Twin Wasp S1C3-G | Pratt & Whitney Twin Wasp S3C3-G | Pratt & Whitney Twin Wasp S3C4-G |
| Arrangement | Radial | Radial | Radial | Radial | Radial | Radial | Radial |
| Cooling | Air | Air | >Air | Air | Air | Air | Air |
| No of Cyls | 9 | 9 | 14 | 14 | 14 | 14 | 14 |
| Bore/Stroke | 6.125" x 6.375" | 6.125" x 6.375" | 5.312" x 5.312" | 5.5" x 5.5" | 5.5" x 5.5" | 5.5" x 5.5" | 5.5" x 5.5" |
| Displacement | 1690cu ins | 1690 cu ins | 1535 cu ins | 1830 cu ins | 1830 cu ins | 1830 cu ins | 1830 cu ins |
| Comp Ratio | 6.0:1 | 6.5:1 | 6.75:1 | 6.7:1 | 6.70:1 | 6.7:1 | 6.7:1 |
| bmep Cruise | 117 | 123 | 120 | 125 | 130 | 137 | 139 |
| Blower ratio | 10:1 | 10:1 | 11:1 | 7.15:1 | 7.15:1 | 8:1 | 7.15:1 |
| Cyl Material | Steel | Steel | Steel | Steel | Steel | Steel | Steel |
| Valves per cyl | 1 Inl 1 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh | 1 Inl 1 Exh |
| Valve Arr. | OHV | OHV | OHV | OHV | OHV | OHV | OHV |
| HP max - not Take-Off | 650 | 750 | 750 | 900 | 1050 | 950 | 1100 |
| @ RPM | 2000 | 2250 | 2550 | 2550 | 2550 | 2700 | 2550 |
| @ Altitude | Sea Level | 7000ft | 9500ft | 12000ft | 7500ft | 14300ft | 6200ft |
| HP Take-Off | 650 | 875 | 825 | 1050 | 1200 | 1100 | 1200 |
| @ RPM | 2000 | 2300 | 2625 | 2700 | 2700 | 2700 | 2700 |
| HP Cruise | 450 | 525 | 525 | 650 | 700 | 700 | 700 |
| @ RPM | 1800 | 2000 | 2250 | 2250 | 2325 | 2200 | 2175 |
| Fuel Octane | 80 | 87 | 87 | 87 | 90 | 100 | 100 |
| Prop Drive | Direct | Geared | Geared | Geared | Geared | Geared | Geared |
| Dry Weight | 975lbs | 1087lbs | 1133lbs | 1450lbs | 1450lbs | 1465lbs | 1490lbs |
| lb/Cruise HP | 2.16 | 2.07 | 2.16 | 2.23 | 2.07 | 2.09 | 2.13 |
| Carb(s) | 1x Stromberg | 1x Stromberg | 1x Stromberg | 1x Stromberg | 1x Stromberg | 1x Stromberg | 1x Stromberg |
| Ignition | Scintilla Mag(2) | Scintilla Mag(2) | Scintilla Mag(2) | Scintilla Mag(2) | Scintilla Mag(2) | Scintilla Mag(2) | Scintilla Mag(2) |
| Electric Starter | Optional | Optional | Optional | Optional | Optional | Optional | Optional |
| Length | 44.234" | 50.516" | 53.266" | 60.312" | 60.312" | 61.50" | 63.312" |
| Height/O.D. | 54.437" | 54.437" | 44.125" | 48" | 48" | 48" | 48" |
| Width | NA | NA | NA | NA | NA | NA | NA |
| Ht above bed | NA | NA | NA | NA | NA | NA | NA |
| Mount Dia | 23.375" | 23.375" | 23.375" | 27" | 27" | 27" | 27" |